Foreign direct investment (“FDI”)–economic activity involving ownership with an element of active control by a foreigner–now involves considerably more dollars than interstate transactions involving trade in goods. FDI outflows exceeded the one-trillion-dollar mark in 2000 and, despite the recent economic downturn, the United States and the United Kingdom remain leaders for both outgoing and incoming foreign investment. Acquisitions by foreigners of established domestic enterprises (including newly privatized state enterprises), along with new greenfield investments by foreign nationals, are a principal symptom, as well as a product of, globalization. This symposium issue addresses the various legal regimes, national and international, that govern this significant component of cross-boundary international economic activity.